When a computed GO TO statement
is executed, the arith_expr is evaluated. The resulting value
is used as an index into stmt_label_list. Control then
transfers to the statement whose statement label you identify by the
index. For example, if the value of arith_expr is 4, control
transfers to the statement whose statement label is fourth in the
stmt_label_list, provided there are at least four labels in the
list.

If the value of arith_expr is less than 1 or greater than the
number of statement labels in the list, the GO TO statement has no
effect (like a CONTINUE statement), and the
next statement is executed.